Differential gearing.



J. A. HARDY. DIFFERENTIAL GEARING. l APPLICATION FILED FEB. 5, 1913. 1,093,578, Patented A131114, 1914.

2 SHEET$ SBEET 2' o with the ground and even e jerk* .5 titedferentiei int-eV s n j" nbiic of new ind neen ich me iollonf'i'lnl U' is Weii known the di i l or balance which. 'nes been eppiied to anto ino/'olie vehicles?, to pei nit the driving Wiieeie to esserne one to the otie.: e ceitnin reizitive movement @regente nrmerone de, dim. because ei the rnoieiii y o' tlie ivlieele. F .ice `t may wien e*ertingg n e ediieeion foi-ent, degertn inipoeeilole by tlie inet tins nlleel le d f''en donnie speed by vtile di'erential, other Wheel reinem- ,etetionf 'v on. the ground. iiioreovermin sneden nreirenpplying action 'ipentiei sind bed en; lesion et one o: 'one i f 'die iotter may step 'of even tne Wrong direction; the other Wlieei ioiiering "properiy to the ,vronnd will maintain the seine speed sind tne rete ci tievei oi the veilicie vv'iii be iler-.diy sieclen ened. iiiso, et high sneed and under the inm- ^Y 5^' reed siiocL'e when one driving Wheel ifionienteriiy ienvee the ground it reces evvey under die fiction oit the diifei'entiel. tlie didi ng ei'i'ort on the other Wheel in lessened; ttie result ie considerable weer ci the tires .vlnen, the iviieei regains contact u progress. 'ierione arrangements here eireedy been tried, which ere controiied by the driver and conipieteiy loclr tlie erentinl. 'iiiese nrsingenientsene `c a' et oi? the eoove mentioned iinzonveniencee te be ovni ed? but since they coinpieteiy soppresse the notion of the difierentiei they not suited to remedy the other inconveniences.

The presentinvention evoide these incon differential 'free to ect in turning corners inst ice.

The invention coneiets in arranging e breite, which incrire entorneticeily, to limit the speed of reletive mevenent oi the driving Wheeis by. iocling; there inet wget-ner ne soon neitiie toned oi this movement attains e vpredeterniined` limit5 revolutions e innnrten A"n this wey iiretmn "non in turning @einem and prevent tiieivlieele 'troni of one or' fer inetnnce 'tvventy iid, teilt.

oonneetion eetnbliened by the special breite device een be effected either directiv between the driving Wheels or between the enge of tne differential geen and one or other ci the Wheeie7 or again between tlie driving "neit end one or otlie oi the wheels.

inthe uccoi-npanying Clievving:l3`ignre l 'e plan of portion of e driving,` mechanism to which my invention is applied; Fifi: 2

einiiier view showing' my invention epd thereto in e. modified arnngernent; Fig. 3 ie e section through a differential to which my invention applied; and Figs. Li: and are reepectively longitudinal :ind cross sections through braking device in which my invention is embodied.

Fig l sliofv'e by Way of example n dingrani oit the arrangement on n vehicle driven by a. propeller eiwit. Each driving- Wheel A A1 is provided with n toothed crown a el A.vitli which there engages e pinion o l keyed upon :L shaft c c1 tliese shafts which lieve tl'le Seine axis are connected together by the automatic b oke device l. Bearings snite-biy arranged on the casing ci the reer bridge Support the shafts c c1. Since the braking" device constructed to act outo- ,meticeliy ne soon :is the relative speed of the slieitn c and c1 :ind consequently that of the Wiieeis e. and il exceeds :i certain limit, it will e understood that these shafts sind therefore the lWheeie ii and A] will become 'locked together as soon es this relative speed ie passed.

Fig. 2 shows n second example of the mounting or". the ei'rengeinent, in cese the dierentiol is mounted on an auxiliary shaft, es on e countereheit in the chain driven vehicle, tor instance, l in tliie cese connect tile shafts c c1 which are feet to the driving Wheels fi. and 1, loy the intermediary of the bra-king; apparatus.

Fig. 3 represents in vertical section an arrangement in which the braking appare,- tus ie combined with tne diiiere'ntial itself. The pinione e, e are the satellite pinions of the differential. The driving .slieft t drives the dierentiel in customary manner throughthe lbevel pinions 151 and t2. The gear plate j" ci the differential is keyed to the shaft c of. one ci the wheels and this Shaft e is solid Witii the part l ot the brake. The other geerplete 'f1- oi" the dierentiel is solid withv the @heit c1 o' the otherwneei, this 'shaft having un enlarged end (Z which. furnis casing of Athe brake. bvio'usly this si rangement operates in precisely the seine manner es the constructions shown in Figs. l .and 2. A method of carrying out this4 brake device is shown hy way of exemple in Figs. l end 5, in which Fig. il is e. long-itu dinal section on line of Fie". 5, und 5 is e. section on line .5e-5 of Fig. ln this exemple, the brake arrangement is composed of e rot-ary oil pump, one of the parts of which is connected to one or the shafts c el and the other part to the other shaft; this oil pump delivers on itself, that is, in u closed cycle, endfit is actuated in such u mannerl that when ite speed of rotation tends to accelerate, the increusin; pressure of oil sets upon u'balenced piston;I this piston 1 effects the throttlingo the outlet pipe for i oil und because of the incompressihility of the oil, prevents the rotation of the pump, As the speed of the rotation of 'the pump corresponds with the speed of the relative movement of the shafts c c1 oi the Wheels A and A1, it will be understood that I Vcan thus vided with three venes or blades g g* g driven by the shaft c und turning in u pumpbody or casing ci fast with the shaft c1. shaft c carries intermediary of small split cylinders z' forming joints or packing-and allowing euch of them to remain during rotation in e pinne the cylindrical passing through the axis of bore of the pump-body- The inlet and delivery pipes j and 1 of ,7'1 and 'k1 With a cylindrical -chuznber Z hollowed out in the exis pump body and in which m provided with u position of the groove ports jl enel Fcl olosed'when the piston is pushed toward the left.t At this moment the blades ure stopped in the pump easing' because of the incornpressibility of the oil und the shafts e c turn fest together. pressure of the oil is employed, this pressure increasing in the pump when speed is eceelereted.

cirulur groove mi. A rllhe the piston m that is to suy of For thisl purpose i have rovided in the course of the, oioes 7p ,t 1i and a passages n o provided mito iiep valves n1 o1 which Whatever he the i" of rotation allow the pressure of c on the front face m2 of the piston m.

that is to eey limit the speed or this relutive .movement to such a. ligure as muy have j` heen xed. The rotary oil-pump is pro- The at its extremity i cylindrical inember zvvhlch drives the blades by theyv the pump connectl at 5 of .rotetion of the 5 can travel u piston i m1 determines the size o i' the which cnn be completelvi To slide the piston mthe the rot-ery A iid fr screwed on the body of the pump maintains in the apparatus u certain reserve.

oi" oil. l Qbviously the construction shown nifty loe g variously modified to accomplish the seme i end in like or :analogous situations und is to be regarded es merely :in exemplary emj hodinient of my invention.

l' cleini us my invention:

l.. in a. device of the character described, e peil of rotors, e connnon driving rotor therefor and un operative connection hetween seid rotors whereby the seine muy have varying; speeds und liuid breite ineens operatively connected to two of seid rotors end serving to eutometicully broke the rotor moving et a speed in excess of that of the coperutinf rotor.

.lu e, evice of the character described,

i a. puir of rotors, :i counnon driving rotor `fthereitor and an operative connection be I tween seid rotors whereby the seme muy have varying speeds und fluid brake ineens operatively connected to two of seid rotors and serving to eutoniaticelly lock seid rotors against relative rotation after one oit' seid rotors has reached u predeterminetlispeed in excess of the cooperating rotor.

3. in e. device of the character described, n pair oi rotors, u common. driving rotor therefor und un operative connection loetiveen seid rotors whereby the suine muy have varying speeds und fluid broke ineens operatively connected to two of and comprisingl u casing with finiti circulating passages, iiuid driving ineens, :i throttle vulve arranged in seid fluid circu-` loting pussuge, and ineens for subie" f seid throttle vulve to the variation in i sure ou opposite sides of the Huid driving;

ineens, whereby the vulve is uctuu'l'ed to con`- described,

l f In testimony whereof l". have signed luv l' l i tivo subscribing Witnesses.

JEAN HARDE'.

H' w 15 i w leem/.Ion desmanes,

) Wilitness'es z v wimmmcam said rotors trol the circulatory passage, suhstuutinlly os nume to this specification in the presence oi (l Li liU 

